/* 清除浮动 */
.clearfix::after {
    content: '';
    height: 0;
    display: block;
    clear: both;
}

.clearfix {
    zoom: 1;
}

/* 设置父元素高宽 */
html,
body {
    height: 100%;
    width: 100%;
}

/* 左浮动 */
.fl {
    float: left;
}

/* 右浮动 */
.fr {
    float: right;
}

/* logo和导航栏 */
#logoNav {
    height: 50px;
    width: 100%;
    background: #428bca;
    position: absolute;
    top: 0;
    left: 0;
}

#logoNav .logo {
    margin-top: 6px;
    margin-left: 26px;
    margin-right: 24px;
}

#logoNav>ul li {
    padding-left: 20px;
    padding-right: 20px;
    float: left;
    font-size: 14px;
    line-height: 50px;
}

#logoNav>ul a {
    color: #fff;
}

#logoNav>ul img {
    padding-right: 5px;

}

#logoNav .teach {
    background: white;
}

#logoNav .teach a {
    color: #558ac5;
    border-bottom: 2px solid #558ac5;
    padding-bottom: 15px;
    padding-top: 14px;
}

#logoNav .lecturer {
    float: right;
}

#logoNav .lecturer li {
    float: left;
    font-size: 12px;
    line-height: 50px;
    margin-right: 20px;
}

#logoNav .lecturer a {
    color: #fff;
}

#logoNav .lecturer img {
    margin-left: 5px;
}

/* 教学系统和后台首页 */
#teachingsystemBackgroundpage {
    width: 100%;
    position: absolute;
    top: 50px;
    left: 0;
    bottom: 0;
}

/* 教学系统 */
.teachingsystem {
    height: 100%;
    width: 190px;
    background: #f2f2f2;
    float: left;
    border-right: 1px solid #cccccc;
}

.teachingsystem li {
    height: 40px;
    width: 100%;
    border-bottom: 1px solid #e5e5e5;
    line-height: 40px;
    background: url(../images/arrows3.png) no-repeat 166px center;
    font-size: 12px;
}

.teachingsystem li div {
    margin-left: 12px;
    width: 21px;
    height: 18px;
    display: inline-block;
    text-align: center;
}

.teachingsystem li a {
    color: #585858;
    margin-left: 10px;
}

.teachingsystem .first {
    background: #fff url(../images/arrows3.png) no-repeat 166px center;
    border-right: 2px solid #2b7dbc;
    position: relative;
    margin-bottom: 36px;
}

.teachingsystem .first a {
    color: #2b7dbc;
    font-weight: 700;
}

.teachingsystem .first>img {
    position: absolute;
    right: -1px;
    top: 5px;
}

.teachingsystem .first li {
    height: 34px;
    background: #6fb3e0;
    border-right: 2px solid #2b7dbc;
    line-height: 34px;
}

.teachingsystem .first li a {
    margin-left: 35px;
    color: #fff;
    font-weight: 400;
}

.arrow {
    width: 100%;
    height: 26px;
    background: #f3f3f3;
    border-bottom: 1px solid #e5e5e5;
}

.arrow a {
    display: block;
    width: 18px;
    height: 18px;
    border: 1px solid #bebebe;
    border-radius: 25px;
    line-height: 14px;
    margin-left: 80px;
    margin-top: 8px;
    text-align: center;
}

/* 后台首页 */
/* 头部 */
.backgroundpage {
    height: 100%;
    overflow: hidden;
}

.backgroundpage .top {
    height: 40px;
    border-bottom: 1px solid #e5e5e5;
}

.backgroundpage .top li {
    float: left;
    font-size: 12px;
    line-height: 40px;
}

.backgroundpage .top .manage {
    color: #4c8fbd;
    margin-left: 15px;
}

.backgroundpage .top img {
    margin-left: 6px;
}

.backgroundpage .top .backstage {
    color: #555;
    margin-left: 7px;
}

.backgroundpage .top .right {
    font-size: 12px;
    line-height: 40px;
    color: #000;
    margin-right: 52px;
    font-weight: 700;
}

.backgroundpage .top .right input {
    border: 1px solid #6fb3e0;
    border-radius: 4px;
    width: 150px;
    height: 26px;
}

.backgroundpage .top .right form {
    display: inline-block;
    position: relative;
}

.backgroundpage form img {
    position: absolute;
    top: 13px;
    right: 7px;
}

/* 表格框 */
.backgroundpage .fralanguage {
    border: 1px solid #c5d0dc;
    padding-top: 16px;
    padding-left: 12px;
    padding-right: 12px;
    margin: 8px 32px 15px 32px;
}

.backgroundpage .fralanguage table {
    border: 1px solid #ddd;
    height: 376px;
    border-collapse: collapse;
    margin-bottom: 30px;
    width: 100%;
}

.backgroundpage .fralanguage table td {
    border: 1px solid #ddd;
    height: 30px;
    line-height: 30px;
    padding-left: 8px;
    color: #393939;
    font-size: 12px;
}

.backgroundpage .fralanguage thead {
    background: #f5f5f5;
    border-bottom: 2px solid #dddddd;
}

.backgroundpage .fralanguage thead td {
    font-weight: 700;
    color: #707070;
}

.backgroundpage .fralanguage tbody tr:nth-child(odd) {
    background: #f9f9f9;
}

/* 直播 */
.backgroundpage .livebroadcast {
    height: 80px;
    border-top: 2px solid #c5d0dc;
    margin-left: -12px;
    margin-right: -12px;
}

.backgroundpage .livebroadcast a {
    display: block;
    width: 64px;
    height: 60px;
    background: #3b98d6;
    color: #fff;
    font-size: 12px;
    text-align: center;
    margin-top: 10px;
    margin-left: 12px;
}

.backgroundpage .livebroadcast img {
    margin-top: 6px;
    margin-bottom: 6px;
}